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ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
ACCRUED LIABILITIES |  |  |
Accrued payroll and benefits | $ 4,422 | $ 3,675 |
Accrued property taxes | 99 | 128 |
Income taxes payable | 127 | 155 |
Accrued professional fees | 236 | 74 |
Accrued warranty liability | 671 | 601 | $ 1,054
Accrued regulatory settlement | 500 | 500 |
Accrued environmental reserve | 1,241 | 1,300 |
Accrued self-insurance reserve | 909 | 1,464 |
Accrued other | 225 | 237 |
Total accrued liabilities | $ 8,430 | $ 8,134 |

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